I 15 over Rock Creek
GoodLewis and Clark County, Montana · 3M N Wolf Creek · Structure no. I00015230+03001
- Built
- 1967
- 58 years old
- Condition
- Good
- inspected April 2024
- Type
- Culvert
- Steel
- Length
- 30 ft
- 2 main spans
- Daily traffic
- 4,290
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Rock Creek is a steel culvert carrying I 15 over Rock Creek in Lewis and Clark County, Montana. It was built in 1967, so it is 58 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 4,290 vehicles a day, roughly 17% of them trucks, projected to reach 4,569 by 2043. The structure is 30 ft (9.2 m) long.
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Rock Creek built?
It was built in 1967, making it 58 years old in 2025.
What condition is I 15 over Rock Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.
How much traffic does I 15 over Rock Creek carry?
About 4,290 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is I 15 over Rock Creek?
The structure is 30 ft (9.2 m) long with a longest span of 11 ft (3.4 m).
Who owns I 15 over Rock Creek?
It is owned by the State Highway Agency.